content: /*******************************************************************************
   * Copyright 2011, 2012 Chris Banes.
   *
   * Licensed under the Apache License, Version 2.0 (the "License");
   * you may not use this file except in compliance with the License.
   * You may obtain a copy of the License at
   *
   * http://www.apache.org/licenses/LICENSE-2.0
   *
   * Unless required by applicable law or agreed to in writing, software
   * distributed under the License is distributed on an "AS IS" BASIS,
   * WITHOUT WARRANTIES OR CONDITIONS OF ANY KIND, either express or implied.
   * See the License for the specific language governing permissions and
   * limitations under the License.
   *******************************************************************************/
  package com.handmark.pulltorefresh.library.internal;
  
  import android.content.Context;
  import android.content.res.TypedArray;
  import android.graphics.Matrix;
  import android.graphics.drawable.Drawable;
  import android.view.animation.Animation;
  import android.view.animation.RotateAnimation;
  import android.widget.ImageView.ScaleType;
  
  import com.handmark.pulltorefresh.library.PullToRefreshBase.Mode;
  import com.handmark.pulltorefresh.library.PullToRefreshBase.Orientation;
  import com.handmark.pulltorefresh.library.R;
  
  public class RotateLoadingLayout extends LoadingLayout {
  
  	static final int ROTATION_ANIMATION_DURATION = 1200;
  
  	private final Animation mRotateAnimation;
  	private final Matrix mHeaderImageMatrix;
  
  	private float mRotationPivotX, mRotationPivotY;
  
  	private final boolean mRotateDrawableWhilePulling;
  
  	public RotateLoadingLayout(Context context, Mode mode, Orientation scrollDirection, TypedArray attrs) {
  		super(context, mode, scrollDirection, attrs);
  
  		mRotateDrawableWhilePulling = attrs.getBoolean(R.styleable.PullToRefresh_ptrRotateDrawableWhilePulling, true);
  
  		mHeaderImage.setScaleType(ScaleType.MATRIX);
  		mHeaderImageMatrix = new Matrix();
  		mHeaderImage.setImageMatrix(mHeaderImageMatrix);
  
  		mRotateAnimation = new RotateAnimation(0, 720, Animation.RELATIVE_TO_SELF, 0.5f, Animation.RELATIVE_TO_SELF,
  				0.5f);
  		mRotateAnimation.setInterpolator(ANIMATION_INTERPOLATOR);
  		mRotateAnimation.setDuration(ROTATION_ANIMATION_DURATION);
  		mRotateAnimation.setRepeatCount(Animation.INFINITE);
  		mRotateAnimation.setRepeatMode(Animation.RESTART);
  	}
  
  	public void onLoadingDrawableSet(Drawable imageDrawable) {
  		if (null != imageDrawable) {
  			mRotationPivotX = Math.round(imageDrawable.getIntrinsicWidth() / 2f);
  			mRotationPivotY = Math.round(imageDrawable.getIntrinsicHeight() / 2f);
  		}
  	}
  
  	protected void onPullImpl(float scaleOfLayout) {
  		float angle;
  		if (mRotateDrawableWhilePulling) {
  			angle = scaleOfLayout * 90f;
  		} else {
  			angle = Math.max(0f, Math.min(180f, scaleOfLayout * 360f - 180f));
  		}
  
  		mHeaderImageMatrix.setRotate(angle, mRotationPivotX, mRotationPivotY);
  		mHeaderImage.setImageMatrix(mHeaderImageMatrix);
  	}
  
  	@Override
  	protected void refreshingImpl() {
  		mHeaderImage.startAnimation(mRotateAnimation);
  	}
  
  	@Override
  	protected void resetImpl() {
  		mHeaderImage.clearAnimation();
  		resetImageRotation();
  	}
  
  	private void resetImageRotation() {
  		if (null != mHeaderImageMatrix) {
  			mHeaderImageMatrix.reset();
  			mHeaderImage.setImageMatrix(mHeaderImageMatrix);
  		}
  	}
  
  	@Override
  	protected void pullToRefreshImpl() {
  		// NO-OP
  	}
  
  	@Override
  	protected void releaseToRefreshImpl() {
  		// NO-OP
  	}
  
  	@Override
  	protected int getDefaultDrawableResId() {
  		return R.drawable.default_ptr_rotate;
  	}
  
  }
  